Need help answering the question. A. Classifying Physical and Chemecal Change: F
ID: 488851 • Letter: N
Question
Need help answering the question.
A. Classifying Physical and Chemecal Change:
For the following, record your observations, decide if the change is chemical or physical, and give a reason for your conclusion.
1. Magnesium in the flame.
Type of Change:_____________Evidence:_______________
Was a new substance(s) present at the end of this change?__________
2. Copper sulfate solution ixed with sodium hydroxide solution the tube.
Type of Change:_____________Evidence________________
Was a new substance(s) present at the end of this change?__________
3. Vinegar mixed with milk.
Type of Change:_____________Evidence________________
Was a new substance(s) present at the end of this change?______
4. Distillation
Type of Change:_____________Evidence________________
Was a new substance(s) present at the end of this change?________
5. Change of state of iodine
Type of Change:_____________Evidence________________
Was a new substance(s) present at the end of this change?_________
6. Electrolysis of water
Type of Change:_____________Evidence________________
Was a new substance(s) present at the end of this change?__________
7. Reactiom of Zinc and sulfur
Type of Change:_____________Evidence________________
Was a new substance(s) present at the end of this change?____________
8. Reaction of Sodium in water
Type of Change:_____________Evidence________________
Was a new substance(s) present at the end of this change?____________
Thank you.
Explanation / Answer
physical change --> there is only change of phase/property but the specie is still the SAME chemical specie, there is no breaking/forming of bonds
chemical change --> there is a molecular rearrangement, bodns are broken/formed
1. Magnesium in the flame.
Type of Change: CHEMICAL Evidence Flame will burn it in order to form MgO, there is formation of gases
Was a new substance(s) present at the end of this change? YEs, MgO
2. Copper sulfate solution ixed with sodium hydroxide solution the tube.
Type of Change: Physical change no reaction Evidence no change in Temperature/color/phase
Was a new substance(s) present at the end of this change? no
3. Vinegar mixed with milk.
Type of Change: chemical reaciton! Evidence there is heat/change in color, precipitate
Was a new substance(s) present at the end of this change? yes, since proteins + acid reacted
4. Distillation
Type of Change: Physical Evidence no change in properties, but distribution of mix
Was a new substance(s) present at the end of this change? no
5. Change of state of iodine
Type of Change:By definition, this is just a phas echange, so Physical Evidence no chang ein structur
Was a new substance(s) present at the end of this change?no
6. Electrolysis of water
Type of Change:Chemiocal Evidence H2O form gas, H2 and O2
Was a new substance(s) present at the end of this change?_yes, H2gas and O2gas
7. Reactiom of Zinc and sulfur
Type of Change:as the name implies, REACITON so CHEMICAL Evidence Zn and SO4 form a solid
Was a new substance(s) present at the end of this change?yes
8. Reaction of Sodium in water
Type of Change:CHEMICAL Evidence drastic explosion, change in pH
Was a new substance(s) present at the end of this change? Yesm, NaO
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